package com.wn.utils;

public class BD {
    // WGS-84 坐标系 转 GCJ-02
    private final static double pi = 3.14159265358979324;
    private final static double a = 6378245.0;
    private final static double ee = 0.00669342162296594323;
    // GCJ-02坐标系 转 BD-09
    private static final double x_pi = 3.14159265358979324 * 3000.0 / 180.0;


    /**
     * @param lat:纬度
     *            lon:经度 gps纬度转百度地图
     * @return 0:纬度 1:经度
     */
    public static Double[] getBaiDu(double lat, double lon) {
        double latlng[] = new double[2];
        Double[] result = new Double[2];
        if (lat > 0 && lon> 0) {// 有经纬度上报
            double[] transform = transform(lat, lon, latlng);
            if (transform != null) {
                result[0] = bd_encrypt(transform[0], transform[1])[0];
                result[1] = bd_encrypt(transform[0], transform[1])[1];
                return result;
            }
        }
        result[0] = 0.0;
        result[1] = 0.0;
        return result;
    }


    private static double[] transform(double wgLat, double wgLon, double[] latlng) {
//  if (outOfChina(wgLat, wgLon)) {
//  latlng[0] = wgLat;
//  latlng[1] = wgLon;
//  return null;
//  }
        double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
        double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
        double radLat = wgLat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        latlng[0] = wgLat + dLat;
        latlng[1] = wgLon + dLon;
        return latlng;
    }


    private static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347)
            return true;
        if (lat < 0.8293 || lat > 55.8271)
            return true;
        return false;
    }


    private static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }


    private static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }


    private static double[] bd_encrypt(double gg_lat, double gg_lon) {
        double x = gg_lon, y = gg_lat;
        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
        double bd_lon = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        double[] tmp = new double[2];
        tmp[0] = bd_lat;
        tmp[1] = bd_lon;
        return tmp;
    }
}
